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Updated: Jul 10, 2026

A Murine Model of Dengue Virus-induced Acute Viral Encephalitis-like Disease
Published on: April 28, 2019
[Acute disseminated encephalomyelitis (ADEM) onset during meningitis and sepsis]
Hachiro Ohnishi1, Yasunori Sawayama, Iwao Ariyama
1Department of Environmental Medicine and Infectious Disease, Faculity of Medical Sciences, Kyushu University.
Abstract:
A 39-year-old man with a high fever, headache, and stiff neck, and Kernig and Brudzinski signs admitted in June 2004 had a WBC of 10,680/microL and CRP of 10.5mg/dL. Streptococcus pneumoniae was detected in blood and spinal fluid culture, but brain CT was normal. Meningitis was diagnosed and antibiotics and corticosteroids begun. After four days of treatment, his blood test and spinal fluid data had improved, but his consciousness had deteriorated. ADEM was diagnosed by the clinical course and brain MRI (T2-weighted image) that showed high-intensity lesions in the white cerebral matter, and steroid pulse treatment was begun on day 4 after admission. His consciousness disturbance rapidly disappeared and brain MRI showed that the multiple high-intensity lesions had ameliorated. The patient was released after 40 days of treatment.
Insights
This case study highlights a patient initially diagnosed with bacterial meningitis who later developed acute disseminated encephalomyelitis (ADEM). Prompt steroid treatment successfully resolved ADEM symptoms and brain lesions.
Area of Science:
- Neurology
- Infectious Diseases
Background:
- Bacterial meningitis can present with symptoms like fever, headache, and stiff neck.
- Early antibiotic and corticosteroid treatment is standard for suspected meningitis.
Observation:
- A patient initially treated for Streptococcus pneumoniae meningitis showed clinical improvement but neurological deterioration.
- Brain MRI revealed white matter lesions consistent with ADEM, not typical of initial meningitis.
Findings:
- Acute disseminated encephalomyelitis (ADEM) was diagnosed based on clinical progression and MRI findings.
- High-dose steroid pulse therapy led to rapid resolution of neurological symptoms and MRI lesions.
Implications:
- This case underscores the importance of considering ADEM in meningitis patients with atypical neurological decline.
- Early recognition and treatment of ADEM with corticosteroids are crucial for favorable outcomes.
Related Concept Videos
Encephalitis l: Introduction
Bacterial Meningitis I: Introduction
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Encephalitis ll: Pathophysiology
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Bacterial Meningitis II: Pathophysiology
